Desa TPNA-A(-HA) Pilot/Electrode Assembly Adjustment, Burner Flame Adjustment, Decorative Facing

Installation

Continued

DECORATIVE FACING

Any noncombustible material may be used for facing (glass, tile, brick, etc.) as long as the proper clearances are observed (see Clearances, page 6). IMPORTANT: Louvered openings must not be ob- structed, and upper and lower panels must remain removable for servicing. Use only heat-resistant, noncombustible mortar or adhesive when securing facing material.

Note: Combustible material, such as wood, that has been fireproofed is not considered noncom- bustible.

Pilot/Electrode

Assembly Adjustment

The pilot assembly is factory preset for the proper flame height. Alteration to these settings may have occurred during shipping and handling. If this is the case, some minor adjustment may be necessary and should be done by a qualified technician. To access the pilot assembly, the glass door must be opened. The proper settings for the thermopile height should be at a distance of 3/8" to 1/2" from the pilot flame as shown in Figure 52.

The electrode is installed at the factory for proper positioning. However, alterations to the position may have occurred due to shipping and handling. These settings may need adjustment and must be done by a qualified technician. The correct position and height is as shown in Figure 53.

1/8"
(0.3cm)	3/8" - 1/2"
	(.95cm-1.3cm)

Figure 52 - Correct Pilot Flame Pattern

3/4"

(19 mm)

1/2"

(12.7 mm)

Edge of Burner	Top of
	Burner

Figure 53 - Correct Ignitor Location

(Side View)

Burner Flame

Adjustment

The air shutter, located at the base of the main burner (see Figure 54), has been factory preset to the proper air-to-gas ratio which results in an even, clean burning flame across the burner (see Figure 55). If readjustment is necessary, you can restore the proper air-to-gas ratio by loosening the air shutter screw and rotating the air shutter until the proper flame setting is achieved (the shutter's normal setting is fully open. Do not forget to retighten the air shutter screw.

	Air
Air Shutter	Opening Adjustment Burner
Orifice	Screw

		Venturi
		Tube
Firebox Bottom		Burner Gas Line
Figure 54 - Air Shutter Adjustment
CORRECT		Long, Blue Flame with
		Yellow Tips
INCORRECT
CLOSE
SHUTTER	Short, Sharp, Blowing Flame

INCORRECT

OPEN SHUTTER

Long, Uneven, Yellow Flame

Figure 55 - Burner Flame Patterns

Burner Removal

CAUTION: Before proceed- ing to open glass door or handle logs, make sure the entire unit is cool.

1.Remove top and bottom louvers and screen as- sembly. Undo 4 latches and open glass door.

2.Carefully remove the log set intact and set aside (see Figure 56, page 27).

3.Remove the 2 screws holding burner to hearth pan.

26 www.desatech.com 56131-F